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In 2006, when 38-year-old Dena Riley met convicted rapist Richard Davis, their relationship turned out to be a marriage made in hell. They shared the same twisted desire for three-way sex--followed by murder.

In 2006, when 38-year-old Dena Riley met convicted rapist Richard Davis, their relationship turned out to be a marriage made in hell. They shared the same twisted desire for three-way sex--followed by murder.

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Robert Lopez warned women he loved never to betray him. In 2005, after serving 10 years for stabbing and nearly killing his first girlfriend, Lopez had a new girlfriend. But when she gave Lopez reason to doubt her affection, he exacted fatal revenge.

Robert Lopez warned women he loved never to betray him. In 2005, after serving 10 years for stabbing and nearly killing his first girlfriend, Lopez had a new girlfriend. But when she gave Lopez reason to doubt her affection, he exacted fatal revenge.

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In 2011 Maksim Gelman went on a brutal killing spree in New York City that left four people dead and four wounded. It began when he killed his stepfather by stabbing him 55 times, and ended 28 hours later in a bloody confrontation with the NYPD.

In 2011 Maksim Gelman went on a brutal killing spree in New York City that left four people dead and four wounded. It began when he killed his stepfather by stabbing him 55 times, and ended 28 hours later in a bloody confrontation with the NYPD.